Positive Doubling Charge Pump with
Shutdown in SOT Package
TC1240
TC1240
Positive Doubling Charge Pump with Shutdown
in SOT Package
FEATURES
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Space Saving 6-Pin SOT-23A Package
>99% Typical Voltage Conversion Efficiency
Voltage Doubling
Operates from +2.5V to +4.0V
Low Output Resistance (17
Ω
Typical)
Only Two External Capacitors Required
Consumes 180
µ
A (Typical) in Active Mode
Power-Saving Shutdown Mode (1
µ
A Maximum)
Fully Compliant with 1.8V Logic Sytems
GENERAL DESCRIPTION
The TC1240 is a doubling CMOS charge-pump voltage
converter in a small 6-Pin SOT-23A package. TC1240
doubles an input voltage which can range from +2.5V to
+4.0V. Conversion efficiency is typically >99%. Internal
oscillator frequency is 160kHz for the TC1240. The TC1240
has an active high shutdown which limits the current con-
sumption of the device to less than 1µA.
External component requirement is only two capacitors
for standard voltage doubler applications. All other circuitry,
including control, oscillator, power MOSFETs are integrated
on-chip. Typical supply current is 180µA and the device is
available in a 6-Pin SOT-23A surface mount package.
APPLICATIONS
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Cellular Phones
Pagers
PDAs, Portable Dataloggers
Battery-Powered Devices
Handheld Instruments
ORDERING INFORMATION
Part
Number
TC1240ECH
Package
6-Pin SOT-23A
Temp. Range
–40°C to +85°C
TYPICAL OPERATING CIRCUIT
PIN CONFIGURATION
Positive Voltage Doubler
6-Pin SOT-23A
C
+
C
1
C
–
SHDN
TC1240
ON
OFF
V
IN
INPUT
V
IN
1
6
C+
GND 2
TC1240ECH
5
OUT
OUT
GND
C
2
2 x INPUT
C–
3
4
SHDN
NOTE: *6-Pin SOT-23A is equivalent to EIAJ SC-74
TC1240-1 7/7/00
TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.
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TELCOM [ TELCOM SEMICONDUCTOR, INC ]
